Stretchable tracks for laser-machined neural electrode arrays. 2009

Martin Schuettler, and Damir Pfau, and Juan S Ordonez, and Christian Henle, and Peter Woias, and Thomas Stieglitz
Laboratory for Biomedical Microtechnology, Dept. of Microsystems Engineering - IMTEK, University of Freiburg, Germany. schuettler@ieee.org

An easy and fast method for fabrication of neural electrode arrays is the patterning of platinum foil and spin-on silicone rubber using a laser. However, the mechanical flexibility of such electrode arrays is limited by the integrated tracks that connect the actual electrode sites and the contacts to which wires are welded. Changing the design from straight lines to meanders, the tracks can be stretched to a certain extend defined by the shape of the meanders. Horse-shoe-like designs described by an opening angle theta = 60 degrees and ratio between curvature radius r and track width w of r/w = 3.6 permitted stretching of 14.4% before track breakage. For r/w = 11.7 a maximum elongation at break of 19.7% was measured. Larger opening angles theta provided even better flexibility but with increasing theta, the tensile strength and the electrical conductance of a single track is compromised and the maximum integration density (tracks per area) decreases.

UI MeSH Term Description Entries
D007834 Lasers An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum. Masers,Continuous Wave Lasers,Pulsed Lasers,Q-Switched Lasers,Continuous Wave Laser,Laser,Laser, Continuous Wave,Laser, Pulsed,Laser, Q-Switched,Lasers, Continuous Wave,Lasers, Pulsed,Lasers, Q-Switched,Maser,Pulsed Laser,Q Switched Lasers,Q-Switched Laser
D004566 Electrodes Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum. Anode,Anode Materials,Cathode,Cathode Materials,Anode Material,Anodes,Cathode Material,Cathodes,Electrode,Material, Anode,Material, Cathode
D016571 Neural Networks, Computer A computer architecture, implementable in either hardware or software, modeled after biological neural networks. Like the biological system in which the processing capability is a result of the interconnection strengths between arrays of nonlinear processing nodes, computerized neural networks, often called perceptrons or multilayer connectionist models, consist of neuron-like units. A homogeneous group of units makes up a layer. These networks are good at pattern recognition. They are adaptive, performing tasks by example, and thus are better for decision-making than are linear learning machines or cluster analysis. They do not require explicit programming. Computational Neural Networks,Connectionist Models,Models, Neural Network,Neural Network Models,Neural Networks (Computer),Perceptrons,Computational Neural Network,Computer Neural Network,Computer Neural Networks,Connectionist Model,Model, Connectionist,Model, Neural Network,Models, Connectionist,Network Model, Neural,Network Models, Neural,Network, Computational Neural,Network, Computer Neural,Network, Neural (Computer),Networks, Computational Neural,Networks, Computer Neural,Networks, Neural (Computer),Neural Network (Computer),Neural Network Model,Neural Network, Computational,Neural Network, Computer,Neural Networks, Computational,Perceptron

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